1237fead6SMichael Halcrow /** 2237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 3237fead6SMichael Halcrow * 4237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 5237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 6dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 7237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 8237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 9237fead6SMichael Halcrow * 10237fead6SMichael Halcrow * This program is free software; you can redistribute it and/or 11237fead6SMichael Halcrow * modify it under the terms of the GNU General Public License as 12237fead6SMichael Halcrow * published by the Free Software Foundation; either version 2 of the 13237fead6SMichael Halcrow * License, or (at your option) any later version. 14237fead6SMichael Halcrow * 15237fead6SMichael Halcrow * This program is distributed in the hope that it will be useful, but 16237fead6SMichael Halcrow * WITHOUT ANY WARRANTY; without even the implied warranty of 17237fead6SMichael Halcrow * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18237fead6SMichael Halcrow * General Public License for more details. 19237fead6SMichael Halcrow * 20237fead6SMichael Halcrow * You should have received a copy of the GNU General Public License 21237fead6SMichael Halcrow * along with this program; if not, write to the Free Software 22237fead6SMichael Halcrow * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 23237fead6SMichael Halcrow * 02111-1307, USA. 24237fead6SMichael Halcrow */ 25237fead6SMichael Halcrow 26237fead6SMichael Halcrow #include <linux/file.h> 27237fead6SMichael Halcrow #include <linux/vmalloc.h> 28237fead6SMichael Halcrow #include <linux/pagemap.h> 29237fead6SMichael Halcrow #include <linux/dcache.h> 30237fead6SMichael Halcrow #include <linux/namei.h> 31237fead6SMichael Halcrow #include <linux/mount.h> 32237fead6SMichael Halcrow #include <linux/crypto.h> 330cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 345a0e3ad6STejun Heo #include <linux/slab.h> 3548b512e6SRoberto Sassu #include <linux/xattr.h> 360a688ad7SHarvey Harrison #include <asm/unaligned.h> 37237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 38237fead6SMichael Halcrow 39237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 40237fead6SMichael Halcrow { 41237fead6SMichael Halcrow struct dentry *dir; 42237fead6SMichael Halcrow 438dc4e373SMiklos Szeredi dir = dget_parent(dentry); 44908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 45237fead6SMichael Halcrow return dir; 46237fead6SMichael Halcrow } 47237fead6SMichael Halcrow 48237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 49237fead6SMichael Halcrow { 50237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 51237fead6SMichael Halcrow dput(dir); 52237fead6SMichael Halcrow } 53237fead6SMichael Halcrow 54c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 55c4f79073STyler Hicks { 56c4f79073STyler Hicks if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) 57c4f79073STyler Hicks return 1; 58c4f79073STyler Hicks return 0; 59c4f79073STyler Hicks } 60c4f79073STyler Hicks 615ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 62c4f79073STyler Hicks { 635ccf9203STyler Hicks struct inode *lower_inode = opaque; 645ccf9203STyler Hicks 655ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 665ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 675ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 685ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 695ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 70c4f79073STyler Hicks inode->i_version++; 71c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 725ccf9203STyler Hicks 735ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 745ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 755ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 765ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 775ccf9203STyler Hicks else 785ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 795ccf9203STyler Hicks 805ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 815ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 825ccf9203STyler Hicks else if (special_file(inode->i_mode)) 835ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 845ccf9203STyler Hicks else 855ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 865ccf9203STyler Hicks 87c4f79073STyler Hicks return 0; 88c4f79073STyler Hicks } 89c4f79073STyler Hicks 905ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 915ccf9203STyler Hicks struct super_block *sb) 925ccf9203STyler Hicks { 935ccf9203STyler Hicks struct inode *inode; 945ccf9203STyler Hicks 955ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 965ccf9203STyler Hicks return ERR_PTR(-EXDEV); 975ccf9203STyler Hicks if (!igrab(lower_inode)) 985ccf9203STyler Hicks return ERR_PTR(-ESTALE); 995ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 1005ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 1015ccf9203STyler Hicks lower_inode); 1025ccf9203STyler Hicks if (!inode) { 1035ccf9203STyler Hicks iput(lower_inode); 1045ccf9203STyler Hicks return ERR_PTR(-EACCES); 1055ccf9203STyler Hicks } 1065ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1075ccf9203STyler Hicks iput(lower_inode); 1085ccf9203STyler Hicks 1095ccf9203STyler Hicks return inode; 1105ccf9203STyler Hicks } 1115ccf9203STyler Hicks 112c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 113c4f79073STyler Hicks struct super_block *sb) 114c4f79073STyler Hicks { 1155ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 116c4f79073STyler Hicks 1175ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 118c4f79073STyler Hicks unlock_new_inode(inode); 1195ccf9203STyler Hicks 120c4f79073STyler Hicks return inode; 121c4f79073STyler Hicks } 122c4f79073STyler Hicks 123c4f79073STyler Hicks /** 124c4f79073STyler Hicks * ecryptfs_interpose 125c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 126c4f79073STyler Hicks * @dentry: ecryptfs' dentry 127c4f79073STyler Hicks * @sb: ecryptfs's super_block 128c4f79073STyler Hicks * 129c4f79073STyler Hicks * Interposes upper and lower dentries. 130c4f79073STyler Hicks * 131c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 132c4f79073STyler Hicks */ 133c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1345ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 135c4f79073STyler Hicks { 1365ccf9203STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); 1375ccf9203STyler Hicks 138c4f79073STyler Hicks if (IS_ERR(inode)) 139c4f79073STyler Hicks return PTR_ERR(inode); 140c4f79073STyler Hicks d_instantiate(dentry, inode); 1415ccf9203STyler Hicks 142c4f79073STyler Hicks return 0; 143c4f79073STyler Hicks } 144c4f79073STyler Hicks 145237fead6SMichael Halcrow /** 146237fead6SMichael Halcrow * ecryptfs_create_underlying_file 147237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 148f70f582fSQinghuang Feng * @dentry: New file's dentry 149237fead6SMichael Halcrow * @mode: The mode of the new file 150237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 151237fead6SMichael Halcrow * 152237fead6SMichael Halcrow * Creates the file in the lower file system. 153237fead6SMichael Halcrow * 154237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 155237fead6SMichael Halcrow */ 156237fead6SMichael Halcrow static int 157237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 158237fead6SMichael Halcrow struct dentry *dentry, int mode, 159237fead6SMichael Halcrow struct nameidata *nd) 160237fead6SMichael Halcrow { 161237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 162237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 163237fead6SMichael Halcrow struct dentry *dentry_save; 164237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 1652e21b3f1STyler Hicks unsigned int flags_save; 166237fead6SMichael Halcrow int rc; 167237fead6SMichael Halcrow 16870b89021STyler Hicks if (nd) { 1694ac91378SJan Blunck dentry_save = nd->path.dentry; 1704ac91378SJan Blunck vfsmount_save = nd->path.mnt; 1712e21b3f1STyler Hicks flags_save = nd->flags; 1724ac91378SJan Blunck nd->path.dentry = lower_dentry; 1734ac91378SJan Blunck nd->path.mnt = lower_mnt; 1742e21b3f1STyler Hicks nd->flags &= ~LOOKUP_OPEN; 17570b89021STyler Hicks } 176237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 17770b89021STyler Hicks if (nd) { 1784ac91378SJan Blunck nd->path.dentry = dentry_save; 1794ac91378SJan Blunck nd->path.mnt = vfsmount_save; 1802e21b3f1STyler Hicks nd->flags = flags_save; 18170b89021STyler Hicks } 182237fead6SMichael Halcrow return rc; 183237fead6SMichael Halcrow } 184237fead6SMichael Halcrow 185237fead6SMichael Halcrow /** 186237fead6SMichael Halcrow * ecryptfs_do_create 187237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 188237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 189237fead6SMichael Halcrow * @mode: The mode of the new file 190237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 191237fead6SMichael Halcrow * 192237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 193237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 194237fead6SMichael Halcrow * stat of the lower directory inode. 195237fead6SMichael Halcrow * 196237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 197237fead6SMichael Halcrow */ 198237fead6SMichael Halcrow static int 199237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 200237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 201237fead6SMichael Halcrow struct nameidata *nd) 202237fead6SMichael Halcrow { 203237fead6SMichael Halcrow int rc; 204237fead6SMichael Halcrow struct dentry *lower_dentry; 205237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 206237fead6SMichael Halcrow 207237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 208237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 209801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 210237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 211237fead6SMichael Halcrow "dentry\n"); 212237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 213237fead6SMichael Halcrow goto out; 214237fead6SMichael Halcrow } 215237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 216237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 2174981e081SMichael Halcrow if (rc) { 218caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 21918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 220237fead6SMichael Halcrow goto out_lock; 221237fead6SMichael Halcrow } 222237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2235ccf9203STyler Hicks directory_inode->i_sb); 224237fead6SMichael Halcrow if (rc) { 225237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 226237fead6SMichael Halcrow goto out_lock; 227237fead6SMichael Halcrow } 2280cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2290cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 230237fead6SMichael Halcrow out_lock: 231237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 232237fead6SMichael Halcrow out: 233237fead6SMichael Halcrow return rc; 234237fead6SMichael Halcrow } 235237fead6SMichael Halcrow 236237fead6SMichael Halcrow /** 237237fead6SMichael Halcrow * ecryptfs_initialize_file 238237fead6SMichael Halcrow * 239237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 240237fead6SMichael Halcrow * file with a header and first data page. 241237fead6SMichael Halcrow * 242237fead6SMichael Halcrow * Returns zero on success 243237fead6SMichael Halcrow */ 244237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 245237fead6SMichael Halcrow { 246d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 247d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 248237fead6SMichael Halcrow int rc = 0; 249237fead6SMichael Halcrow 250237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 251237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 252e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 253d7cdc5feSMichael Halcrow goto out; 254237fead6SMichael Halcrow } 255237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 256237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 257237fead6SMichael Halcrow if (rc) { 258d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 259d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 260d7cdc5feSMichael Halcrow goto out; 261237fead6SMichael Halcrow } 2623b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, 2633b06b3ebSTyler Hicks ecryptfs_dentry->d_inode); 264391b52f9SMichael Halcrow if (rc) { 265391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 266332ab16fSTyler Hicks "the lower file for the dentry with name " 267391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 268391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 269391b52f9SMichael Halcrow goto out; 270391b52f9SMichael Halcrow } 271d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 272332ab16fSTyler Hicks if (rc) 273d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 274332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 275237fead6SMichael Halcrow out: 276237fead6SMichael Halcrow return rc; 277237fead6SMichael Halcrow } 278237fead6SMichael Halcrow 279237fead6SMichael Halcrow /** 280237fead6SMichael Halcrow * ecryptfs_create 281237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 282237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 283237fead6SMichael Halcrow * @mode: The mode of the new file. 284237fead6SMichael Halcrow * @nd: nameidata 285237fead6SMichael Halcrow * 286237fead6SMichael Halcrow * Creates a new file. 287237fead6SMichael Halcrow * 288237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 289237fead6SMichael Halcrow */ 290237fead6SMichael Halcrow static int 291237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 292237fead6SMichael Halcrow int mode, struct nameidata *nd) 293237fead6SMichael Halcrow { 294237fead6SMichael Halcrow int rc; 295237fead6SMichael Halcrow 296addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 297237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 298237fead6SMichael Halcrow if (unlikely(rc)) { 299237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 300237fead6SMichael Halcrow "lower filesystem\n"); 301237fead6SMichael Halcrow goto out; 302237fead6SMichael Halcrow } 303237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 304237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 305237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 306237fead6SMichael Halcrow out: 307237fead6SMichael Halcrow return rc; 308237fead6SMichael Halcrow } 309237fead6SMichael Halcrow 310237fead6SMichael Halcrow /** 3115ccf9203STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 312237fead6SMichael Halcrow */ 3135ccf9203STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *ecryptfs_dentry, 314addd65adSMichael Halcrow struct dentry *lower_dentry, 31570b89021STyler Hicks struct inode *ecryptfs_dir_inode) 316237fead6SMichael Halcrow { 317237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 318237fead6SMichael Halcrow struct vfsmount *lower_mnt; 3195ccf9203STyler Hicks struct inode *inode, *lower_inode; 3202aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 321237fead6SMichael Halcrow char *page_virt = NULL; 322332ab16fSTyler Hicks int put_lower = 0, rc = 0; 323237fead6SMichael Halcrow 324addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 325addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 326addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 327237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 328addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 329b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 330addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 331237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 332e94b1766SChristoph Lameter GFP_KERNEL)); 333addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 334237fead6SMichael Halcrow rc = -ENOMEM; 335addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 336addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 337addd65adSMichael Halcrow __func__); 33831f73beeSLino Sanfilippo goto out_put; 339237fead6SMichael Halcrow } 340addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 341addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 342237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 343237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 344addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 345237fead6SMichael Halcrow goto out; 346237fead6SMichael Halcrow } 3475ccf9203STyler Hicks inode = __ecryptfs_get_inode(lower_inode, ecryptfs_dir_inode->i_sb); 3485ccf9203STyler Hicks if (IS_ERR(inode)) { 3495ccf9203STyler Hicks rc = PTR_ERR(inode); 350addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 351addd65adSMichael Halcrow __func__, rc); 352391b52f9SMichael Halcrow goto out; 353237fead6SMichael Halcrow } 3543b06b3ebSTyler Hicks if (!S_ISREG(inode->i_mode)) { 3555ccf9203STyler Hicks if (inode->i_state & I_NEW) 3565ccf9203STyler Hicks unlock_new_inode(inode); 3575ccf9203STyler Hicks d_add(ecryptfs_dentry, inode); 358237fead6SMichael Halcrow goto out; 3593b06b3ebSTyler Hicks } 360237fead6SMichael Halcrow /* Released in this function */ 361addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 362237fead6SMichael Halcrow if (!page_virt) { 363addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 364addd65adSMichael Halcrow __func__); 365237fead6SMichael Halcrow rc = -ENOMEM; 3663b06b3ebSTyler Hicks make_bad_inode(inode); 367391b52f9SMichael Halcrow goto out; 368237fead6SMichael Halcrow } 3693b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode); 370391b52f9SMichael Halcrow if (rc) { 371391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 372332ab16fSTyler Hicks "the lower file for the dentry with name " 373391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 374addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 3753b06b3ebSTyler Hicks make_bad_inode(inode); 376addd65adSMichael Halcrow goto out_free_kmem; 377391b52f9SMichael Halcrow } 378332ab16fSTyler Hicks put_lower = 1; 3793b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3802aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3812aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3822aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 3833b06b3ebSTyler Hicks rc = ecryptfs_read_and_validate_header_region(page_virt, inode); 384237fead6SMichael Halcrow if (rc) { 3851984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 386addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 3873b06b3ebSTyler Hicks inode); 388dd2a3b7aSMichael Halcrow if (rc) { 389237fead6SMichael Halcrow rc = 0; 3903b06b3ebSTyler Hicks goto unlock_inode; 391237fead6SMichael Halcrow } 392dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 393dd2a3b7aSMichael Halcrow } 3943b06b3ebSTyler Hicks ecryptfs_i_size_init(page_virt, inode); 3953b06b3ebSTyler Hicks unlock_inode: 3963b06b3ebSTyler Hicks if (inode->i_state & I_NEW) 3973b06b3ebSTyler Hicks unlock_new_inode(inode); 3983b06b3ebSTyler Hicks d_add(ecryptfs_dentry, inode); 399addd65adSMichael Halcrow out_free_kmem: 400237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 401237fead6SMichael Halcrow goto out; 40231f73beeSLino Sanfilippo out_put: 403237fead6SMichael Halcrow dput(lower_dentry); 40431f73beeSLino Sanfilippo mntput(lower_mnt); 405addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 406237fead6SMichael Halcrow out: 407332ab16fSTyler Hicks if (put_lower) 4083b06b3ebSTyler Hicks ecryptfs_put_lower_file(inode); 409addd65adSMichael Halcrow return rc; 410addd65adSMichael Halcrow } 411addd65adSMichael Halcrow 412addd65adSMichael Halcrow /** 413addd65adSMichael Halcrow * ecryptfs_lookup 414addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 415addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 416addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 417addd65adSMichael Halcrow * 418addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 419addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 420addd65adSMichael Halcrow */ 421addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 422addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 423addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 424addd65adSMichael Halcrow { 425addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 426a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 427addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 428addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 429addd65adSMichael Halcrow int rc = 0; 430addd65adSMichael Halcrow 431addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 432addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 433addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 434addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 435addd65adSMichael Halcrow goto out_d_drop; 436addd65adSMichael Halcrow } 437addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4388787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4398787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4408787c7a3STyler Hicks lower_dir_dentry, 4418787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4428787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 443addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 444addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4458787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4469f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4479f37622fSTyler Hicks encrypted_and_encoded_name); 448addd65adSMichael Halcrow goto out_d_drop; 449addd65adSMichael Halcrow } 450addd65adSMichael Halcrow if (lower_dentry->d_inode) 4515ccf9203STyler Hicks goto interpose; 452addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 453addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4542aac0cf8STyler Hicks if (!(mount_crypt_stat 4552aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4565ccf9203STyler Hicks goto interpose; 457addd65adSMichael Halcrow dput(lower_dentry); 458addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 459addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4602aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 461addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 462addd65adSMichael Halcrow if (rc) { 463addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 464addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 465addd65adSMichael Halcrow goto out_d_drop; 466addd65adSMichael Halcrow } 4678787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4688787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4698787c7a3STyler Hicks lower_dir_dentry, 4708787c7a3STyler Hicks encrypted_and_encoded_name_size); 4718787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 472addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 473addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4748787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4759f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 476addd65adSMichael Halcrow encrypted_and_encoded_name); 477addd65adSMichael Halcrow goto out_d_drop; 478addd65adSMichael Halcrow } 4795ccf9203STyler Hicks interpose: 4805ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 48170b89021STyler Hicks ecryptfs_dir_inode); 482addd65adSMichael Halcrow goto out; 483addd65adSMichael Halcrow out_d_drop: 484addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 485addd65adSMichael Halcrow out: 486addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 487237fead6SMichael Halcrow return ERR_PTR(rc); 488237fead6SMichael Halcrow } 489237fead6SMichael Halcrow 490237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 491237fead6SMichael Halcrow struct dentry *new_dentry) 492237fead6SMichael Halcrow { 493237fead6SMichael Halcrow struct dentry *lower_old_dentry; 494237fead6SMichael Halcrow struct dentry *lower_new_dentry; 495237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 496237fead6SMichael Halcrow u64 file_size_save; 497237fead6SMichael Halcrow int rc; 498237fead6SMichael Halcrow 499237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 500237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 501237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 502237fead6SMichael Halcrow dget(lower_old_dentry); 503237fead6SMichael Halcrow dget(lower_new_dentry); 504237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 505237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 506237fead6SMichael Halcrow lower_new_dentry); 507237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 508237fead6SMichael Halcrow goto out_lock; 5095ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 510237fead6SMichael Halcrow if (rc) 511237fead6SMichael Halcrow goto out_lock; 5123a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5133a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 514237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 515237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 516237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 517237fead6SMichael Halcrow out_lock: 518237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 519237fead6SMichael Halcrow dput(lower_new_dentry); 520237fead6SMichael Halcrow dput(lower_old_dentry); 521237fead6SMichael Halcrow return rc; 522237fead6SMichael Halcrow } 523237fead6SMichael Halcrow 524237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 525237fead6SMichael Halcrow { 526237fead6SMichael Halcrow int rc = 0; 527237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 528237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5298dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 530237fead6SMichael Halcrow 5319c2d2056STyler Hicks dget(lower_dentry); 5328dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 533237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 534237fead6SMichael Halcrow if (rc) { 535ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 536237fead6SMichael Halcrow goto out_unlock; 537237fead6SMichael Halcrow } 5380cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 539237fead6SMichael Halcrow dentry->d_inode->i_nlink = 540237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 541237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 542caeeeecfSMichael Halcrow d_drop(dentry); 543237fead6SMichael Halcrow out_unlock: 5448dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5459c2d2056STyler Hicks dput(lower_dentry); 546237fead6SMichael Halcrow return rc; 547237fead6SMichael Halcrow } 548237fead6SMichael Halcrow 549237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 550237fead6SMichael Halcrow const char *symname) 551237fead6SMichael Halcrow { 552237fead6SMichael Halcrow int rc; 553237fead6SMichael Halcrow struct dentry *lower_dentry; 554237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 555237fead6SMichael Halcrow char *encoded_symname; 556addd65adSMichael Halcrow size_t encoded_symlen; 557addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 558237fead6SMichael Halcrow 559237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 560237fead6SMichael Halcrow dget(lower_dentry); 561237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 562addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 563addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 564addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 565addd65adSMichael Halcrow &encoded_symlen, 566addd65adSMichael Halcrow NULL, 567addd65adSMichael Halcrow mount_crypt_stat, symname, 568addd65adSMichael Halcrow strlen(symname)); 569addd65adSMichael Halcrow if (rc) 570237fead6SMichael Halcrow goto out_lock; 571237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 572db2e747bSMiklos Szeredi encoded_symname); 573237fead6SMichael Halcrow kfree(encoded_symname); 574237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 575237fead6SMichael Halcrow goto out_lock; 5765ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 577237fead6SMichael Halcrow if (rc) 578237fead6SMichael Halcrow goto out_lock; 5790cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5800cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 581237fead6SMichael Halcrow out_lock: 582237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 583237fead6SMichael Halcrow dput(lower_dentry); 584237fead6SMichael Halcrow if (!dentry->d_inode) 585237fead6SMichael Halcrow d_drop(dentry); 586237fead6SMichael Halcrow return rc; 587237fead6SMichael Halcrow } 588237fead6SMichael Halcrow 589237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 590237fead6SMichael Halcrow { 591237fead6SMichael Halcrow int rc; 592237fead6SMichael Halcrow struct dentry *lower_dentry; 593237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 594237fead6SMichael Halcrow 595237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 596237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 597237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 598237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 599237fead6SMichael Halcrow goto out; 6005ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 601237fead6SMichael Halcrow if (rc) 602237fead6SMichael Halcrow goto out; 6030cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6040cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 605237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 606237fead6SMichael Halcrow out: 607237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 608237fead6SMichael Halcrow if (!dentry->d_inode) 609237fead6SMichael Halcrow d_drop(dentry); 610237fead6SMichael Halcrow return rc; 611237fead6SMichael Halcrow } 612237fead6SMichael Halcrow 613237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 614237fead6SMichael Halcrow { 615237fead6SMichael Halcrow struct dentry *lower_dentry; 616237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 61745ec4abaSMichael Halcrow int rc; 618237fead6SMichael Halcrow 619237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 62045ec4abaSMichael Halcrow dget(dentry); 621237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 62245ec4abaSMichael Halcrow dget(lower_dentry); 623237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 62445ec4abaSMichael Halcrow dput(lower_dentry); 62507850552STyler Hicks if (!rc && dentry->d_inode) 62607850552STyler Hicks clear_nlink(dentry->d_inode); 6270cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 628237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 629237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 630237fead6SMichael Halcrow if (!rc) 631237fead6SMichael Halcrow d_drop(dentry); 63245ec4abaSMichael Halcrow dput(dentry); 633237fead6SMichael Halcrow return rc; 634237fead6SMichael Halcrow } 635237fead6SMichael Halcrow 636237fead6SMichael Halcrow static int 637237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 638237fead6SMichael Halcrow { 639237fead6SMichael Halcrow int rc; 640237fead6SMichael Halcrow struct dentry *lower_dentry; 641237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 642237fead6SMichael Halcrow 643237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 644237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 645237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 646237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 647237fead6SMichael Halcrow goto out; 6485ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 649237fead6SMichael Halcrow if (rc) 650237fead6SMichael Halcrow goto out; 6510cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6520cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 653237fead6SMichael Halcrow out: 654237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 655237fead6SMichael Halcrow if (!dentry->d_inode) 656237fead6SMichael Halcrow d_drop(dentry); 657237fead6SMichael Halcrow return rc; 658237fead6SMichael Halcrow } 659237fead6SMichael Halcrow 660237fead6SMichael Halcrow static int 661237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 662237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 663237fead6SMichael Halcrow { 664237fead6SMichael Halcrow int rc; 665237fead6SMichael Halcrow struct dentry *lower_old_dentry; 666237fead6SMichael Halcrow struct dentry *lower_new_dentry; 667237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 668237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6690d132f73SErez Zadok struct dentry *trap = NULL; 670237fead6SMichael Halcrow 671237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 672237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 673237fead6SMichael Halcrow dget(lower_old_dentry); 674237fead6SMichael Halcrow dget(lower_new_dentry); 675237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 676237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6770d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6780d132f73SErez Zadok /* source should not be ancestor of target */ 6790d132f73SErez Zadok if (trap == lower_old_dentry) { 6800d132f73SErez Zadok rc = -EINVAL; 6810d132f73SErez Zadok goto out_lock; 6820d132f73SErez Zadok } 6830d132f73SErez Zadok /* target should not be ancestor of source */ 6840d132f73SErez Zadok if (trap == lower_new_dentry) { 6850d132f73SErez Zadok rc = -ENOTEMPTY; 6860d132f73SErez Zadok goto out_lock; 6870d132f73SErez Zadok } 688237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 689237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 690237fead6SMichael Halcrow if (rc) 691237fead6SMichael Halcrow goto out_lock; 6929afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 693237fead6SMichael Halcrow if (new_dir != old_dir) 6949afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 695237fead6SMichael Halcrow out_lock: 696237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 697dd55c898STyler Hicks dput(lower_new_dir_dentry); 698dd55c898STyler Hicks dput(lower_old_dir_dentry); 699237fead6SMichael Halcrow dput(lower_new_dentry); 700237fead6SMichael Halcrow dput(lower_old_dentry); 701237fead6SMichael Halcrow return rc; 702237fead6SMichael Halcrow } 703237fead6SMichael Halcrow 7043a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 7053a60a168STyler Hicks size_t *bufsiz) 706237fead6SMichael Halcrow { 7073a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 708237fead6SMichael Halcrow char *lower_buf; 7093a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 710addd65adSMichael Halcrow mm_segment_t old_fs; 711addd65adSMichael Halcrow int rc; 712237fead6SMichael Halcrow 7133a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 7143a60a168STyler Hicks if (!lower_buf) { 715237fead6SMichael Halcrow rc = -ENOMEM; 716237fead6SMichael Halcrow goto out; 717237fead6SMichael Halcrow } 718237fead6SMichael Halcrow old_fs = get_fs(); 719237fead6SMichael Halcrow set_fs(get_ds()); 720237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 721237fead6SMichael Halcrow (char __user *)lower_buf, 7223a6b42caSTyler Hicks lower_bufsiz); 723237fead6SMichael Halcrow set_fs(old_fs); 7243a60a168STyler Hicks if (rc < 0) 7253a60a168STyler Hicks goto out; 7263a60a168STyler Hicks lower_bufsiz = rc; 7273a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7283a60a168STyler Hicks lower_buf, lower_bufsiz); 7293a60a168STyler Hicks out: 730237fead6SMichael Halcrow kfree(lower_buf); 7313a60a168STyler Hicks return rc; 7323a60a168STyler Hicks } 7333a60a168STyler Hicks 7343a60a168STyler Hicks static int 7353a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7363a60a168STyler Hicks { 7373a60a168STyler Hicks char *kbuf; 7383a60a168STyler Hicks size_t kbufsiz, copied; 7393a60a168STyler Hicks int rc; 7403a60a168STyler Hicks 7413a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7423a60a168STyler Hicks if (rc) 7433a60a168STyler Hicks goto out; 7443a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7453a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7463a60a168STyler Hicks kfree(kbuf); 7473a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7483a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 749237fead6SMichael Halcrow out: 750237fead6SMichael Halcrow return rc; 751237fead6SMichael Halcrow } 752237fead6SMichael Halcrow 753237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 754237fead6SMichael Halcrow { 755237fead6SMichael Halcrow char *buf; 756237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 757237fead6SMichael Halcrow mm_segment_t old_fs; 758237fead6SMichael Halcrow 759237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 760237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 761237fead6SMichael Halcrow if (!buf) { 762806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 763237fead6SMichael Halcrow goto out; 764237fead6SMichael Halcrow } 765237fead6SMichael Halcrow old_fs = get_fs(); 766237fead6SMichael Halcrow set_fs(get_ds()); 767237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 768237fead6SMichael Halcrow set_fs(old_fs); 769806892e9SOGAWA Hirofumi if (rc < 0) { 770237fead6SMichael Halcrow kfree(buf); 771806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 772806892e9SOGAWA Hirofumi } else 773806892e9SOGAWA Hirofumi buf[rc] = '\0'; 774237fead6SMichael Halcrow out: 775806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 776806892e9SOGAWA Hirofumi return NULL; 777237fead6SMichael Halcrow } 778237fead6SMichael Halcrow 779237fead6SMichael Halcrow static void 780237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 781237fead6SMichael Halcrow { 782806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 783806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 784237fead6SMichael Halcrow /* Free the char* */ 785806892e9SOGAWA Hirofumi kfree(buf); 786806892e9SOGAWA Hirofumi } 787237fead6SMichael Halcrow } 788237fead6SMichael Halcrow 789237fead6SMichael Halcrow /** 790237fead6SMichael Halcrow * upper_size_to_lower_size 791237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 792237fead6SMichael Halcrow * @upper_size: Size of the upper file 793237fead6SMichael Halcrow * 794cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 795237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 796237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 797237fead6SMichael Halcrow * 798237fead6SMichael Halcrow * Returns Calculated size of the lower file. 799237fead6SMichael Halcrow */ 800237fead6SMichael Halcrow static loff_t 801237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 802237fead6SMichael Halcrow loff_t upper_size) 803237fead6SMichael Halcrow { 804237fead6SMichael Halcrow loff_t lower_size; 805237fead6SMichael Halcrow 806157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 807237fead6SMichael Halcrow if (upper_size != 0) { 808237fead6SMichael Halcrow loff_t num_extents; 809237fead6SMichael Halcrow 810237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 811237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 812237fead6SMichael Halcrow num_extents++; 813237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 814237fead6SMichael Halcrow } 815237fead6SMichael Halcrow return lower_size; 816237fead6SMichael Halcrow } 817237fead6SMichael Halcrow 818237fead6SMichael Halcrow /** 8195f3ef64fSTyler Hicks * truncate_upper 820237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 8215f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 8225f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 823237fead6SMichael Halcrow * 824237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 825237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 8265f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8275f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8285f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8295f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8305f3ef64fSTyler Hicks * the truncation of the lower inode. 831237fead6SMichael Halcrow * 832237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 833237fead6SMichael Halcrow */ 8345f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8355f3ef64fSTyler Hicks struct iattr *lower_ia) 836237fead6SMichael Halcrow { 837237fead6SMichael Halcrow int rc = 0; 838237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 839237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 840237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 841237fead6SMichael Halcrow loff_t lower_size_before_truncate; 842237fead6SMichael Halcrow loff_t lower_size_after_truncate; 843237fead6SMichael Halcrow 8445f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8455f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 846332ab16fSTyler Hicks return 0; 8475f3ef64fSTyler Hicks } 8483b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 849332ab16fSTyler Hicks if (rc) 850332ab16fSTyler Hicks return rc; 851237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 852237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8535f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8542ed92554SMichael Halcrow char zero[] = { 0x00 }; 855240e2df5SMichael Halcrow 8565f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8572ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8582ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8592ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8602ed92554SMichael Halcrow * file and the new and of the file */ 86148c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8625f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8635f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8645f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8655f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8665f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8672ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8682ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8695f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8702ed92554SMichael Halcrow 8712c27c65eSChristoph Hellwig 8722c27c65eSChristoph Hellwig /* 8732c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8742c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8752c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8762c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8772c27c65eSChristoph Hellwig * ->setattr while would include this. 8782c27c65eSChristoph Hellwig */ 8792c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 88013a791b4STyler Hicks if (rc) 88148c1e44aSAl Viro goto out; 8822c27c65eSChristoph Hellwig 8832c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8842c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8855f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8865f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 88748c1e44aSAl Viro goto out; 88813a791b4STyler Hicks } 8892ed92554SMichael Halcrow if (num_zeros) { 8902ed92554SMichael Halcrow char *zeros_virt; 8912ed92554SMichael Halcrow 8922ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8932ed92554SMichael Halcrow if (!zeros_virt) { 8942ed92554SMichael Halcrow rc = -ENOMEM; 89548c1e44aSAl Viro goto out; 896240e2df5SMichael Halcrow } 89748c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8985f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8992ed92554SMichael Halcrow kfree(zeros_virt); 9005dda6992SMichael Halcrow if (rc) { 901240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 902240e2df5SMichael Halcrow "the remainder of the end page on " 903240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 90448c1e44aSAl Viro goto out; 905240e2df5SMichael Halcrow } 906240e2df5SMichael Halcrow } 9072c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 9080216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 909dd2a3b7aSMichael Halcrow if (rc) { 910dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 911dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 912dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 91348c1e44aSAl Viro goto out; 914dd2a3b7aSMichael Halcrow } 915237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 916237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 917237fead6SMichael Halcrow lower_size_before_truncate = 918237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 919237fead6SMichael Halcrow lower_size_after_truncate = 9205f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 9215f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 9225f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 9235f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 9245f3ef64fSTyler Hicks } else 9255f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 926237fead6SMichael Halcrow } 927237fead6SMichael Halcrow out: 928332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 929237fead6SMichael Halcrow return rc; 930237fead6SMichael Halcrow } 931237fead6SMichael Halcrow 9325f3ef64fSTyler Hicks /** 9335f3ef64fSTyler Hicks * ecryptfs_truncate 9345f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9355f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9365f3ef64fSTyler Hicks * 9375f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9385f3ef64fSTyler Hicks * its corresponding lower inode. 9395f3ef64fSTyler Hicks * 9405f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9415f3ef64fSTyler Hicks */ 9425f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9435f3ef64fSTyler Hicks { 9445f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9455f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9465f3ef64fSTyler Hicks int rc; 9475f3ef64fSTyler Hicks 9485f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9495f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9505f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9515f3ef64fSTyler Hicks 9525f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9535f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9545f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9555f3ef64fSTyler Hicks } 9565f3ef64fSTyler Hicks return rc; 9575f3ef64fSTyler Hicks } 9585f3ef64fSTyler Hicks 959237fead6SMichael Halcrow static int 960b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 961237fead6SMichael Halcrow { 962b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 963b74c79e9SNick Piggin return -ECHILD; 964f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 965237fead6SMichael Halcrow } 966237fead6SMichael Halcrow 967237fead6SMichael Halcrow /** 968237fead6SMichael Halcrow * ecryptfs_setattr 969237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 970237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 971237fead6SMichael Halcrow * 972237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 973237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 974237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 975237fead6SMichael Halcrow * 976237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 977237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 978237fead6SMichael Halcrow */ 979237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 980237fead6SMichael Halcrow { 981237fead6SMichael Halcrow int rc = 0; 982237fead6SMichael Halcrow struct dentry *lower_dentry; 9835f3ef64fSTyler Hicks struct iattr lower_ia; 984237fead6SMichael Halcrow struct inode *inode; 985237fead6SMichael Halcrow struct inode *lower_inode; 986237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 987237fead6SMichael Halcrow 988237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 989e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 990e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 991237fead6SMichael Halcrow inode = dentry->d_inode; 992237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 993e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 994e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 995e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 996e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 99764ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 99864ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 99964ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 1000e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 1001e10f281bSMichael Halcrow 1002e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 1003e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 10043b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 1005332ab16fSTyler Hicks if (rc) { 1006332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 1007332ab16fSTyler Hicks goto out; 1008332ab16fSTyler Hicks } 1009d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 1010332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 10115dda6992SMichael Halcrow if (rc) { 1012e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 1013e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 1014e10f281bSMichael Halcrow rc = -EIO; 101525bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 1016e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 101725bd8174SMichael Halcrow "or the key could not be retrieved. " 101825bd8174SMichael Halcrow "Plaintext passthrough mode is not " 1019e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 1020e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 1021e10f281bSMichael Halcrow goto out; 1022e10f281bSMichael Halcrow } 1023e10f281bSMichael Halcrow rc = 0; 10243aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 10253aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 1026e10f281bSMichael Halcrow } 1027e10f281bSMichael Halcrow } 1028e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10295be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 10305be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 10315be79de2STyler Hicks if (rc) 10325be79de2STyler Hicks goto out; 10335be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 10345be79de2STyler Hicks } 10355f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10365f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10375f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1038237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10395f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1040237fead6SMichael Halcrow if (rc < 0) 1041237fead6SMichael Halcrow goto out; 1042237fead6SMichael Halcrow } 10431ac564ecSJeff Layton 10441ac564ecSJeff Layton /* 10451ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10461ac564ecSJeff Layton * to interpret this in its own way. 10471ac564ecSJeff Layton */ 10485f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10495f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10501ac564ecSJeff Layton 10519c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10525f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10539c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1054237fead6SMichael Halcrow out: 10559afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1056237fead6SMichael Halcrow return rc; 1057237fead6SMichael Halcrow } 1058237fead6SMichael Halcrow 10593a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10603a60a168STyler Hicks struct kstat *stat) 10613a60a168STyler Hicks { 10623a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10633a60a168STyler Hicks int rc = 0; 10643a60a168STyler Hicks 10653a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10663a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10673a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10683a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10693a60a168STyler Hicks char *target; 10703a60a168STyler Hicks size_t targetsiz; 10713a60a168STyler Hicks 10723a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10733a60a168STyler Hicks if (!rc) { 10743a60a168STyler Hicks kfree(target); 10753a60a168STyler Hicks stat->size = targetsiz; 10763a60a168STyler Hicks } 10773a60a168STyler Hicks } 10783a60a168STyler Hicks return rc; 10793a60a168STyler Hicks } 10803a60a168STyler Hicks 1081f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1082f8f484d1STyler Hicks struct kstat *stat) 1083f8f484d1STyler Hicks { 1084f8f484d1STyler Hicks struct kstat lower_stat; 1085f8f484d1STyler Hicks int rc; 1086f8f484d1STyler Hicks 1087f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1088f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1089f8f484d1STyler Hicks if (!rc) { 109055f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 109155f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1092f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1093f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1094f8f484d1STyler Hicks } 1095f8f484d1STyler Hicks return rc; 1096f8f484d1STyler Hicks } 1097f8f484d1STyler Hicks 1098dd2a3b7aSMichael Halcrow int 1099237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1100237fead6SMichael Halcrow size_t size, int flags) 1101237fead6SMichael Halcrow { 1102237fead6SMichael Halcrow int rc = 0; 1103237fead6SMichael Halcrow struct dentry *lower_dentry; 1104237fead6SMichael Halcrow 1105237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1106237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1107cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1108237fead6SMichael Halcrow goto out; 1109237fead6SMichael Halcrow } 111048b512e6SRoberto Sassu 111148b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1112237fead6SMichael Halcrow out: 1113237fead6SMichael Halcrow return rc; 1114237fead6SMichael Halcrow } 1115237fead6SMichael Halcrow 1116dd2a3b7aSMichael Halcrow ssize_t 1117d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1118d7cdc5feSMichael Halcrow void *value, size_t size) 1119d7cdc5feSMichael Halcrow { 1120d7cdc5feSMichael Halcrow int rc = 0; 1121d7cdc5feSMichael Halcrow 1122d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1123cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1124d7cdc5feSMichael Halcrow goto out; 1125d7cdc5feSMichael Halcrow } 1126d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1127d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1128d7cdc5feSMichael Halcrow size); 1129d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1130d7cdc5feSMichael Halcrow out: 1131d7cdc5feSMichael Halcrow return rc; 1132d7cdc5feSMichael Halcrow } 1133d7cdc5feSMichael Halcrow 11347896b631SAdrian Bunk static ssize_t 1135237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1136237fead6SMichael Halcrow size_t size) 1137237fead6SMichael Halcrow { 11382ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11392ed92554SMichael Halcrow value, size); 1140237fead6SMichael Halcrow } 1141237fead6SMichael Halcrow 1142237fead6SMichael Halcrow static ssize_t 1143237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1144237fead6SMichael Halcrow { 1145237fead6SMichael Halcrow int rc = 0; 1146237fead6SMichael Halcrow struct dentry *lower_dentry; 1147237fead6SMichael Halcrow 1148237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1149237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1150cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1151237fead6SMichael Halcrow goto out; 1152237fead6SMichael Halcrow } 1153237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1154237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1155237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1156237fead6SMichael Halcrow out: 1157237fead6SMichael Halcrow return rc; 1158237fead6SMichael Halcrow } 1159237fead6SMichael Halcrow 1160237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1161237fead6SMichael Halcrow { 1162237fead6SMichael Halcrow int rc = 0; 1163237fead6SMichael Halcrow struct dentry *lower_dentry; 1164237fead6SMichael Halcrow 1165237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1166237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1167cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1168237fead6SMichael Halcrow goto out; 1169237fead6SMichael Halcrow } 1170237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1171237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1172237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1173237fead6SMichael Halcrow out: 1174237fead6SMichael Halcrow return rc; 1175237fead6SMichael Halcrow } 1176237fead6SMichael Halcrow 1177754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1178237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1179237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1180237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1181237fead6SMichael Halcrow .permission = ecryptfs_permission, 1182237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11833a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1184237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1185237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1186237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1187237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1188237fead6SMichael Halcrow }; 1189237fead6SMichael Halcrow 1190754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1191237fead6SMichael Halcrow .create = ecryptfs_create, 1192237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1193237fead6SMichael Halcrow .link = ecryptfs_link, 1194237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1195237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1196237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1197237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1198237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1199237fead6SMichael Halcrow .rename = ecryptfs_rename, 1200237fead6SMichael Halcrow .permission = ecryptfs_permission, 1201237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1202237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1203237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1204237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1205237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1206237fead6SMichael Halcrow }; 1207237fead6SMichael Halcrow 1208754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1209237fead6SMichael Halcrow .permission = ecryptfs_permission, 1210237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1211f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1212237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1213237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1214237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1215237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1216237fead6SMichael Halcrow }; 1217